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Request

The Request interface is part of the Fetch API and represents the request of fetch().

Constructor

The Request() constructor creates a new Request instance.

let request = new Request(input, init);

Parameters

name type optional description
resource Request or USVString false The resource can either be a request object or a URL string.
init RequestInit true The init object lets you set optional parameters to apply to the request.

The return type is a Request instance.

RequestInit
name type default description
method string GET The method of the request.
headers Headers or { [key: string]: string } none Th Headers for the request.
body Blob, BufferSource, FormData, URLSearchParams, USVString, or ReadableStream none The body of the request.
cache string none The cache mode of the request.
credentials string same-origin The credentials mode of the request.
integrity string none The crypotographic hash of the request's body.
mode string cors The request mode you want to use.
redirect string follow The mode of how redirects are handled.
referrer string about:client A USVString specifying no-referrer, client or a URL.

Properties

name type description
cache string The cache mode indicates how the (default, no-cache, etc) request should be cached by browser.
credentials string The credentials (omit, same-origin, etc) indicate whether user agent should send cookies in case of CORs of the request.
destination RequestDestination The string indicates the type of content being requested.
body ReadableStream The getter exposes a ReadableStream of the body contents.
bodyUsed boolean Indicates whether the body content is read.
url USVString The URL of the request.
headers Headers The headers associated with the request.
integrity string The crypotographic hash of the request's body.
method string The request's method (POST, GET, etc).
mode string Indicates the mode of the request (e.g. cors ).
redirect string The mode of how redirects are handled.
referrer string The referrer of the request.
referrerPolicy string The referrer policy of the request

All the above properties are read only.

Methods

name description
arrayBuffer() Reads the body stream to its completion and returns an ArrayBuffer object.
blob() Reads the body stream to its completion and returns a Blob object.
formData() Reads the body stream to its completion and returns a FormData object.
json() Reads the body stream to its completion, parses it as JSON and returns a JavaScript object.
text() Reads the body stream to its completion and returns a USVString object (text).
clone() Clones the Request object.

Example

// Create a post request
const request = new Request("https://post.deno.dev", {
  method: "POST",
  body: JSON.stringify({
    message: "Hello world!",
  }),
  headers: {
    "content-type": "application/json",
  },
});

console.log(request.method); // POST
console.log(request.headers.get("content-type")); // application/json

// You can pass the request instance to fetch().
addEventListener("fetch", (event) => {
  event.respondWith(fetch(request));
});

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